The Lubrizol Corporation

Curtis R Scharf

Roger L Sowerby

James N Vinci

Katsumi Hayashi

Stephen A DiBiase

Robert C Richardson

Bernard C Roell, Jr

T Robert Hopkins

Richard M Lange

Craig D Tipton

Joseph W Pialet

James J Schwind

Stephen A Di Biase

Patricia R Todd

William C Tritt

Steven R Twining

This invention relates to a lubricating composition comprising at least about 30% by weight at least one mineral oil, having a kinematic viscosity of less than about 8 cSt at 100&#xb0; C., (A) from about 15% to about 40% by weight of at least one polymer, and (B) up to about 30% by weight of at least one fluidizing agent, provided that when the fluidizing agent is a poly&#x3b1;-olefin having a kinematic viscosity from about 2 to about 30 cSt at 100&#xb0; C., then the poly&#x3b1;-olefin is present in an amount up to about 12% by weight, wherein the lubricating composition has a shear loss of less than about 15% in the 20 hour taper bearing shear test. The invention also relates to concentrates used in preparing lubricating compositions. The present combination of components provides good low and high temperature properties especially when used in combination with one or more mineral oils. In one aspect, the compositions provide improved oxidation resistance.

Lubricating compositions

A grease of an oil of lubricating viscosity, a polyolefin having grafted acid functionality, a metallic species capable of interacting with the acid functionality of said polyolefin to cause association among the acid groups and a co-thickening agent, has improved rheological properties. The co-thickening agent and the metallic species can together comprise a gelled overbased material, particularly an overbased carboxylate.

Functionalized polymer as grease additive

This invention relates to a lubricating composition comprising at least about 30% by weight of at least one mineral oil, having a kinematic viscosity of less than about 8 cSt at 100.degree. C., (A) from about 5% to about 30% by weight at least one polymer having a Mw less than about 10,000, and (B) from about 2% to about 12% by weight of a polymer having a Mw greater than about 15,000, wherein the lubricating composition has a shear loss of less than about 15% in the 20 hour taper bearing shear test. The invention also relates to concentrates used in preparing shear stable lubricating compositions. The present combination of components provides good low and high temperature properties to mineral oils, even at high treat levels. These lubricants have good shear stability and in one aspect have improved oxidation resistance.

Gear oil compositions are described which comprise a lubricating base oil having dissolved therein:

Gear lubricant composition

This invention deals with viscosity improvers which are obtained through the use of a mixed catalyst system comprising a primary and/or secondary organo halide and a Lewis acid catalyst.

Alpha-olefin polymers

Compositions useful as oil additives are prepared in a solvent or a solvent free system by reacting (B) an unsaturated carboxylic acid reagent with (A) a hydrogenated block copolymer in the presence of (C) free radical initiators. The formed reaction product (D) can be further reacted with a (E) primary amine-containing compound in a solvent or a solvent free system.

Graft copolymers prepared from solvent-free reactions and dispersant

A composition of an oil-soluble, olefin-based polymer and an oil-soluble polar polymer having nitrogen functionality, wherein the polymers in combination in oil exhibit incompatibility as evidenced by phase separation, shows improved compatibility by addition to the mixture of certain hydrocarbyl substituted hydroxyaromatic materials.

Polymer compositions of improved compatibility in oil

The invention deals with viscosity improvers which are .alpha.-olefin polymers and are particularly useful in lubricating compositions comprising (A) a liquid .alpha.-olefin polymer having a number average molecular weight from about 2,000 to about 100,000 and having derived from .alpha.-olefins having from about 4 to about 30 carbon atoms, provided further that (A) has a bimodal molecular weight distribution having (i) a peak molecular weight maximum at 2,000 to 5,000 for a lower molecular weight component and (ii) a peak molecular weight maximum at 50,000 to 75,000 for a higher molecular weight component; (B) an oil of lubricating viscosity and (C) at least one member selected from the group consisting of a friction modifier, a sulfurized olefin, an ash-producing detergent and, an ashless dispersant.

Lubricating compositions containing .alpha.-olefin polymers

This invention deals with viscosity improvers which are obtained through the use of a mixed catalyst system comprising a tertiary organo halide and a Lewis acid catalyst.

Nitrogen containing carboxylic compounds useful in reducing hydrogen sulfide are described herein. The compositions of the invention also desirably contain an alkali or alkaline earth metal containing compound.

Compositions containing active sulfur

The invention pertains to a process for preparing a liquid polymer using a mixed catalyst system comprising a primary organo halide and a Lewis acid catalyst.

This invention is directed to phosphorus and/or nitrogen-containing derivative compositions of sulfur containing compounds which are suitable particularly for use as additives for lubricants, fuels and functional fluids. The lubricants, fuels, and/or functional fluids containing the derivatives of this invention exhibit improved anti-wear, extreme pressure and antioxidant properties.

Phosphorus- and/or nitrogen-containing derivatives of sulfur-containing

This invention deals with viscosity improvers which are obtained through the use of a mixed catalyst system comprising a tertiary organo halide and a Lewis acid catalyst. A liquid alpha-olefin polymer composition having a polymodal distribution with peak molecular weight maximum at 2,000 to 5,000 and at 50,000 to 75,000 is useful as a lubricating oil.

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Wickliffe, OH, United States of America

Curtis R Scharf